build-system/node: New API for modifying json.

Introduce (modify-json), (delete-fields), and (replace-fields) to node-build-system

This change introduces helper procedures (modify-json) which takes in lambdas
 which modify the target json #:file which defaults to package.json
This change also includes (delete-fields) and (replace-fields) to help deleting
 and replacing the value of fields in a package.json file.

* guix/build/node-build-system.scm
(modify-json, modify-json-fields, delete-fields, replace-fields,
delete-dev-dependencies): New API exported procedures.
(with-atomic-json-file-replacement, delete-dependencies): Change
procedures to adapt to the new API.

* gnu/packages/node.scm (node-ms-bootstrap,
node-binary-search-bootstrap, node-debug-boostrap,
node-llparse-builder-bootstrap, node-llparse-frontend-boostrap,
node-llparse-bootstrap): Use new API procedures.

* gnu/packages/node-xyz.scm (node-acorn, node-addon-api,
node-buffer-crc32, node-crx3, node-debug, node-file-uri-to-path,
node-ieee754, node-inherits, node-irc, node-irc-colors, node-minimist,
node-ms, node-nan, node-normalize-path, node-once, node-path-key,
node-pbf, node-protocol-buffers-schema, node-readable-stream,
node-resolve-protobuf-schema, node-safe-buffer,
node-safe-stable-stringify, node-semver, node-serialport,
node-serialport-bindings, node-serialport-stream, node-sqlite3,
node-string-decoder, node-tiddlywiki, node-wrappy, node-yazl): Use new
API procedures.

Change-Id: I957f7ca814078d2136d5261985174820235f1369
Signed-off-by: Jelle Licht <jlicht@fsfe.org>

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